polymorphous perverse

adj.
  1. Characterized by or displaying sexual tendencies that have no specific direction, as in an infant or young child, but that may evolve into acts that are regarded as perversions in adults.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.